A 67-year-old man with prostate cancer currently being treated with radiation therapy presents to the hospital with concerns about the inability to urinate for the past 2 days. It is noted that his urinary tract is obstructed and a Foley catheter is inserted with difficulty. Several hours later the patient develops shaking chills and diaphoresis and has a blood pressure of 89/60 mm Hg. It is believed that he has urosepsis, and he is started on antibiotics and pressors for early septic shock. As a result, he develops a tachycardia and an ECG (ECG A) is obtained. His temperature decreases and his blood pressure increases to 120/80 mm Hg at which time the pressors are discontinued. His heart rate is slower and an ECG is repeated (ECG B). What is the diagnosis?